Abstract
The authors carried out a series of experiments with four varieties of spring steel, i.e. two Si-Mn steels, Si-Cr steels and Mn-steel. Changes in these mechanical properties brought about by different heat treatments, and in transformation points due to cooling velocity were measured. The results of this study may be briefly summarised as follows:- (1) Elastic limits of each steels are not very different. (2) Elongation and impact value are maximum in the Si-Mn steel, but lower in the Si-Cr steel. (3) Rates of proportional limit, elastic limit and yield point to tensile strength are changed by the tempering temperature; moduls of elasticity are slightly effected by tempering temperature. (4) Resistance to bending is largest in the Si-Mn steel, while that of Si-Cr steel and Mn steel become large in some tempering temperature.
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